The finding, to be detailed in an upcoming issue of Astrophysical Journal Letters, gives scientists their first real glimpse into a galaxy merger involving multiple big galaxies.

"Most of the galaxy mergers we already knew about are like compact cars crashing together," Rines said. "What we have here is like four sand trucks smashing together, flinging sand everywhere."

Galaxy collisions are a common occurrence in the universe. Our own Milky Way is fated to collide and merge with its neighbor, Andromeda, in about 5 billion years.

Astronomers have observed several clashes involving one big galaxy and several larger ones, and they have also witnessed more major mergers among pairs of big galaxies. But the new findings mark the first time major mergers between multiple hefty galaxies have ever been seen.